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Two new C 21 steroidal glycosides isolated from Cynanchum komarovii.
Chinese Journal of Natural Medicines 2018 August
The present study was designed to further investigate the C21 steroidal glycosides in Cynanchum plants. Two new steroidal glycosides based on a 13, 14:14, 15-disecopregnane-type aglycone, komaroside P (1) and komaroside Q (2), together with three known compounds (3-5) were isolated from the whole herbs of Cynanchum komarovii. The aglycones of compounds 1 and 2 were two new disecopregnane. Their structures were elucidated on the basis of 1D, 2D NMR spectroscopic data and acid hydrolysis. All the compounds (1-5) showed potent inhibitory activities against human leukemia cell lines (HL-60) with IC50 values ranging from 16.6 to 26.3 μmol·L-1 , compared to the positive control 5-fluorouracil (6.4 μmol·L-1 ).
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